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	1.	No cover image available Reproducibility of the K-Ar ages of rocks and minerals : an empirical approach : derivation of a model for estimating the statistical error in K-Ar ages / by R.W. Tabor, R.K. Mark, and R.H. Wilson by Tabor, R. W Mark, Robert K [jt. aut] Wilson, R. H [jt. aut] United States Dept. of Interior Series: U.S. Geological Survey bulletin ; 1654 Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington, D.C. : United States Government Printing Office, 1985 Availability: Items available for loan: National Library of India (1)Call number: U.S 551.701 T 114 r (bul. no. 1654). Place hold Request article Save to lists
	2.	No cover image available An empirical assessment of refraction error in leveling as a function of survey order and environment : an analysis of the results of three North Anerican field experiments designed to measure the systematic component of the atmospheric refraction error in leveling / by Robert O. Castle, Robert K. Mark, and Roger H. Shaw by Castle, Robert O Mark, Robert K [jt. aut] Shaw, Roger H [jt. aut] Series: U.S. Geological Survey bulletin ; 2114 Material type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Washington : U.S. Government Printing Office, 1994 Availability: Items available for loan: National Library of India (1)Call number: U.S. 526.36 Ca 261. Place hold Request article Save to lists

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